The following bug has been logged on the website:
Bug reference: 17446
Logged by: Troy Frericks
Email address: troy(at)frericks(dot)us
PostgreSQL version: 10.17
Operating system: Documentation suggestion, ambiguous
Description:
https://www.postgresql.org/docs/9.6/sql-createindex.html#SQL-CREATEINDEX-CONCURRENTLY
Suggest changing section title "Building Indexes Concurrently" to "Building
Indexes Using the CONCURRENTLY Parameter" to eliminate any ambiguity.